<http://schema.org/description>
"Diagrammatic illustration of radar navigation. This was designed by the Admiralty Research Lab (mainly by Mr.J. Home Dickson) and was aimed to simplify the task of officers navigating a ship in fog or other conditions of bad visibility."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mediastorehouse.com/radar-navigation-at-a-glance-a-new-device/print/4358756.html>